Cryptology ePrint Archive: Report 2005/054
Comment on cryptanalysis of Tseng et al.¡¦s authenticated encryption schemes
Yi-Hwa Chen and Jinn-Ke Jan
Abstract: Recently, Xie and Yu proposed a forgery attack on the Tseng et al¡¦s authenticated encryption schemes and showed that their schemes are not secure in two cases: the specified verifier substitutes his secret key, or the signer generates the signature with these schemes for two or more specified verifiers. In addition, Xie and Yu made a small modification for the Tseng et al¡¦s schemes and claimed that the modified schemes can satisfy the security requirement. However, we show that the modified schemes are still insecure.
Category / Keywords: public-key cryptography / Cryptography; Authenticated encryption; Message linkage; Self-certificated public key
Date: received 22 Feb 2005, last revised 26 Feb 2005, withdrawn 18 Mar 2005
Contact author: yh_chen at seed net tw
Available format(s): (-- withdrawn --)
Note: Revise the title again.
Version: 20050319:063321 (All versions of this report)
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